Improved vest foe sheet-metal cans



@uitrit tufts ige-tent @ffnet ROBERT PORTER, OF PHILADELPHIA, PEN

NSYLVA NIA.

Lettere .Patent No. 74,244, dated .February 11, 1868;

IMPROVED4 VENT FOR SHEET-MEIAL` SANS;

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m TO- ALL WHOM IT MAY. OONCERN:

Be it known that I, ROBERT PORTER, ofthe city of Philadelphia, in theStute of Pennsylvania, have invented anew und useful Improvement inSheet-Metal Ca-nsand I do hereby declare that the following is a'full,clear.` and eiract description oi" the construction and operation ol thesame, referencebeing had to the accompanying drawing, making a. part ol'this specification, and to the letters .of rel'erencemarked thereon lThe nature of my invention consists in providing a sheet-metal can withnnattaehed adjustable vent-'plug` l for-the purpose of facilitating infilling liquids into and discharging them from the can. l

. .Referring tothe drawings, A B is a eoinmoncylindrical tin con,haringv th'e'usu'ul short mouthftnbe a', for receiving a.A cork or otherstopper; C is 'the attached adjustable vent-plug. A short cylindricaltube',, having, in this instance, a screw-thread cut around in its.inner periphery, is soldered ,festin the top plate ofthe con AB, at theside opposite to the mouth-tube a', substantially as represented in thedrawings. The plug 4(l hasl a screw-thread cut around in its stem c, soos to adapt itto be screwed accurately into the'short tube b It has alsoa head which produces a. dat shoulder, c", that fits down closely uponthe upper-end of i5', when the. plug is screwed down lirmly thereon, orupon an intervening washerV or collar, (not shownin the drawing-J so-ias to make an air-tightjoint thereat, substantially as shown in thedrawing.Y The lower end of the plug C has t in this instonce'a slot, 4,cut diametrically across it to the depth ol' about half the length of`the stem c, andet opposite sides of this slot 4 two stays, c c', projectdownward, and (after the plug C is inserted in the tube l 6') bentradially outward at their lower endsso as to cause the sume to come incontact with the lower enl of b', when the plug C is unserewed, orraised high enough to bring the upper end of its slot 4 a little abovethe tube b', hud thus produce the requiredair-vent through the slot.(Sec the faint lines in 'the drnwing,\vhich represent the plug as raisedor the vent opened.) i i It will be readily seen that this simple devicewill afford immediate and always present and ready means of/givingthenecessary vent to a can, either in filling oremptying it, and that it isneither expensive of con` struction and application, nor liable to getout of order, nor allow the can to lea-k at the parl: when closed-pointsof considerable importance to dealers in paint-oils, spirits, &e. I l

.What I claim as new, and desire to secure by Letters Patent, is-

A sheet-metal can provided with an attached vent-plug C, having stays ee', fixed to its' lower end, sopasn to prevent the said plug from beingdetached or entirely withdrawn from its cylindrical tube and at'the sumetime allow o`-its being elevated su'iciently therein to vent the can,asroccasioumay require, as described and set forth.

ROBT. PORTER.

Witn esses BENJ. Momson, B. F. ,.Snurucx.

